非常幸福的英文：
happy as a clam
as happy as the day is long
as happy as a clam
as happy as a lark

参考例句：

He felt intense happiness when he knew that he would attend the famous university.
知道自己将上这所名牌大学,他感到非常幸福。

Now if you come into my house and see a big old mess, you can think bad thoughts if you want, but I feel greatly blessed
现在如果你到了我家会看到一片狼藉,随你怎么想,只要我觉得非常幸福就够了。

happy是什么意思：
adj. 高兴的；使人高兴的；情愿的；放心的；幸运的；恰当的

Health is happiness
健康就是幸福

Content is happiness
知足常乐

Then Zara was happy.
然后扎拉就高兴起来了。

clam是什么意思：
n. 蛤；沉默寡言的人；钳子
v. 嘴紧；捞蛤

It is an edible American clam.
它是一种可食用的美洲蛤蜊。

A crab has two clams.
螃蟹有两个钳。

This wild clam got out of control.
这个沉默寡言的人失去控制了。

day是什么意思：
n. 一天；白昼，白天；工作日；时代，时期

Things go on day by day.
事情逐日进行着。

Day by day the situation is improving.
情况在一天天地好转。

Like this, day after day.
就这样，日复一日。